No. 8.] BIBLIOGRAPHY OF CONNECTICUT GEOLOGY. 4I 



158. Hobbs, W. H. 



An instance of the action of the ice sheet upon slender 

 projecting rock masses. 



Am. Jour. Sci., (4) xiv, 399-403, 2 figs., i pi., 1902. 



Data proving that the former peaks of Sherman hill and Castle rock,. 

 in the Pomperaug valley, were removed by glacier ice. 



159. Hobbs, W. H. 



Tungsten mining at Trumbull Connecticut. 

 U. S. Geol. Surv., Bull. No. 213, 98, 1903. 



Tungsten deposit worked from 1898 to 1901; yield of ore 5%. (See 

 Hobbs, 156.) 



160. Hobbs, W. H. 



Tectonic geographj- of southwestern New England and 

 southeastern New York. 



Geol. Soc. America, Bull., xv, 554-557 ; Science, xix, 527 ; 

 Scient. Am., Supp., Ivii, 23446, 1904. 



The study of certain key areas, among them Twin lakes valley and 

 Pomperaug valley, have demonstrated the prevalence of normal fault 

 structures and their importance in the crustal architecture of the region 

 described. Joints and earth lineaments are found to take the same 

 directions. The facts discovered in the " key areas " are of wider 

 application. 



161. Hobbs, W. H. 



Lineaments of the Atlantic border region. 

 Geol. Soc. America, Bull., xv, 483-506, 4 figs., 3 pis., 

 1904. 



The direction of dominant lineaments (or rectilinear earth features), 

 usually due to faults or joints, is determined for the region between 

 St. Lawrence bay and Georgia. Connecticut is traversed by the Con- 

 necticut and Franconia lines N 5° E, by the northern fall line N 48° E, 

 and by the Rias coast line, N 65° E. 



162. Hovey, E. O. 



Observations on some of the trap ridges of East Haven 

 — ^Branford region. 



Am. Jour. Sci., (3) xxxviii, 361-383, i pL, 1889. Ab- 

 stract: Am. Assoc. Adv. Sci., Proc, xxxviii, 232, 233, 1S90; 

 Am. Nat., xxiv, no, 1890. 



Description of Pond rock (Saltonstall ridge), Totoket mountain, and 

 the neighboring ridges of trap; their general geological relations to the 

 sandstone and to each other; conclusions as to origin; Pond rock con- 

 sidered intrusive. 



163. Hovey, E. O. 



A relatively acid dike in the Connecticut Triassic area. 

 Am. Jour. Sci., (4) iii, 287-292, 3 figs., 1897. 



Petrographic and chemical description of a series of dikes in a 

 railroad cut in Fair Haven. The analysis of one dike shows it to be 

 approximately a bostonite. 



